funkwhale-app-android/app/src/main/java/org/funkwhale/ffa/adapters/ArtistsAdapter.kt

package org.funkwhale.ffa.adapters

import android.content.Context
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.recyclerview.widget.RecyclerView
import org.funkwhale.ffa.R
import org.funkwhale.ffa.fragments.OtterAdapter
import org.funkwhale.ffa.utils.Artist
import org.funkwhale.ffa.utils.maybeLoad
import org.funkwhale.ffa.utils.maybeNormalizeUrl
import com.squareup.picasso.Picasso
import jp.wasabeef.picasso.transformations.RoundedCornersTransformation
import kotlinx.android.synthetic.main.row_artist.view.*

class ArtistsAdapter(val context: Context?, private val listener: OnArtistClickListener) : OtterAdapter<Artist, ArtistsAdapter.ViewHolder>() {
  private var active: List<Artist> = mutableListOf()

  interface OnArtistClickListener {
    fun onClick(holder: View?, artist: Artist)
  }

  init {
    registerAdapterDataObserver(object : RecyclerView.AdapterDataObserver() {
      override fun onChanged() {
        active = data.filter { it.albums?.isNotEmpty() ?: false }

        super.onChanged()
      }

      override fun onItemRangeInserted(positionStart: Int, itemCount: Int) {
        active = data.filter { it.albums?.isNotEmpty() ?: false }

        super.onItemRangeInserted(positionStart, itemCount)
      }
    })
  }

  override fun getItemCount() = active.size

  override fun getItemId(position: Int) = active[position].id.toLong()

  override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
    val view = LayoutInflater.from(context).inflate(R.layout.row_artist, parent, false)

    return ViewHolder(view, listener).also {
      view.setOnClickListener(it)
    }
  }

  override fun onBindViewHolder(holder: ViewHolder, position: Int) {
    val artist = active[position]

    artist.albums?.let { albums ->
      if (albums.isNotEmpty()) {
        Picasso.get()
          .maybeLoad(maybeNormalizeUrl(albums[0].cover?.urls?.original))
          .fit()
          .transform(RoundedCornersTransformation(8, 0))
          .into(holder.art)
      }
    }

    holder.name.text = artist.name

    artist.albums?.let {
      context?.let {
        holder.albums.text = context.resources.getQuantityString(R.plurals.album_count, artist.albums.size, artist.albums.size)
      }
    }
  }

  inner class ViewHolder(view: View, private val listener: OnArtistClickListener) : RecyclerView.ViewHolder(view), View.OnClickListener {
    val art = view.art
    val name = view.name
    val albums = view.albums

    override fun onClick(view: View?) {
      listener.onClick(view, active[layoutPosition])
    }
  }
}